Heat dissipation system of electronic device

A heat dissipation system of an electronic device for dissipating heat from at least one heat source of the electronic device, the heat dissipation system of the electronic device comprising:

• a body having a stack tunnel, wherein the at least one heat source is disposed in the body;
• and
• a heat dissipation module comprising an evaporator and a pipe connecting to the evaporator, wherein the evaporator and the pipe form a loop, and a working fluid is filled in the loop, the evaporator is in thermal contact with the heat source to absorb heat, and the heat generated from the heat source is transferred to the loop through phase transition of the working fluid, and the loop heats the air in the stack tunnel in a two-dimensional manner.